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Re: [T3] Wheel weight affecting whp?


On 3 May 2005 at 9:24, Toby Erkson wrote:

> In another VW forum I'm in a guy said he lost some whp (wheel 
> horsepower) when he installed larger brakes on his [race] car -- this 
> included a larger rim/tire as well I believe.  I don't agree with this 
> but he said his dyno proved it.  Now, I don't know if there was anything 
> else done to the car prior to the 'after' dyno.  Anyway, is it true that 
> changing the rotational mass on the wheels will affect whp?  I can 
> understand acceleration changes but, like a flywheel, its weight 
> shouldn't affect the hp/torque...right?  If I'm wrong please edumicate 
> me :-)  If I'm right, what could be some plausible reasons why his whp 
> dropped?

I'm with you. In the absence of acceleration, I don't see how this would affect 
whp other than by forcing different rpms for a given speed.

I suppose that he might have switched to some tires with big knobby treads, 
which can have large rolling resistance losses....  

-- 
Jim Adney
jadney@vwtype3.org
Madison, WI 53711-3054
USA

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